Male fish from the Phallostethidae family have a unique feature – their reproductive organs are under their chins. The male uses the muscular and complex organ, known as the priapium, to get a firm grip of the female during mating and transfer of gametes.
Formed from the modification of the pectoral and pelvic fins, the organ contains a genital pore, anal opening, a rod called the toxactinium, and a serrated saw called the ctenactinium. The toxactinium and cetenactinium enable the male to grab a female’s head during mating, allowing the priapium to deposit sperm in the female’s throat, where her oviduct opening is. Sounds a little…strange right?
The bizarre nature of this fish was precisely what intrigued Dr. Britz to study them in detail.
“I like weird and small stuff,” he said with a laugh.
Also, to aid in mating, the priapium is curved towards one side – either the left or the right. It is still not known what causes the priapium to grow towards either side of the male’s body, and this conundrum forms the basis of Dr. Britz and Dr. Standing’s research.
During their 6-day visit here, they collected around 40 fish specimens from the Sungei Buloh Wetland Reserve, to bring back to London for genetic analysis.
We wish Dr. Britz and Dr. Standing all the best in their research, and hope to see them again!